not caring enough about something important or about the feelings of other people 漫不经心的;不在乎的 Oxford Collocations DictionaryCavalier is used with these nouns:- attitude
- dismissal
- disregard
- …
Word Originmid 16th cent.: from French, from Italian cavaliere, based on Latin caballus ‘horse’. Compare with Spanish caballero and French chevalier.